The following was taken directly from the jaws message center. I had no idea this feature even existed:
In JAWS, you can temporarily suspend the use of Navigation Quick Keys when on a web page by pressing INSERT+SHIFT+Z if using desktop keyboard layout, and CAPS LOCK+SHIFT+Z in laptop layout. This is useful if you need to use keystrokes native to a particular website that conflict with the use of Navigation Quick Keys. For example, when on YouTube, the letter K is used to play or pause a video. When Navigation Quick Keys are on, pressing K navigates by Place Markers rather than executing the command provided by YouTube. Suspending Navigation Quick Keys enables the use of K to play or pause a video while allowing you to leave the Virtual PC Cursor on to navigate the page as you normally would.
Navigation Quick Keys include T to navigate by table, H to navigate by heading, or L to navigate by list. Navigation Quick Keys are turned on again when you move focus away from the current browser window, navigate to a new page, or execute the command once more.